Allen, Mary, "The Wisdom of the Dogs: Jack London," in her Animals in American Literature, University of Illinois Press, 1983, pp. 77—96.

Geismar, Maxwell, "Jack London: The Short Cut," in his Rebels and Ancestors: The American Novel, 1890—1915, Houghton Mifflin, 1953, pp. 139—216.

Kasdin, Steven J., ed., The Collected Jack London, Barnes and Noble Books, 1992, pp. 217—329.

Ward, Adolphus William, Sir, Alfred Rayney Waller, William Peterfield Trent, John Erskine, Stuart Pratt Sherman, and Carl Van Doren, eds., The Cambridge History of English and American Literature: An Encyclopedia in Eighteen Volumes, Vol. XVI, Cambridge University Press and G. P. Putnam's Sons, 1907—1921.